Tank-dome cover and securing means therefor



DCC. Q BEYER TANK DOME COVER ND SECURING MANS THEREFOR Filed April 9, 1928 ,wrm/Vey Patented Dec. 9, 1930 Unirse STATES JoHNEEYER., 0E BAYONNE, NEW JERSEY, AssIGNoR rro AMERICAN GAR `AND FOUNDEY i' COMPANY, OF NEW YORK, N. Y., AGORIPORATION 0F NEWJERSEY TANK-DOME covEa AND sEcnINe MEANS THEEEFOR 1" PATENT orFlcEf Apiacation med April 9, 192s."'seria1'` No. sacarse-fc,` i

Reference is had to :the accompanying drawings which illustrateV vthe Vpreferred form of the invention, though it is to beun- 'derstood that the invention is notflimited 5; to the exact `details of construction shown and described, as it is obvious that various modifications thereof within the scope of the claims will occur to 'persons `skilled the Y art. In the drawings: f Y

Figure Vl is a top plan view of aportion of a dome cover seatedvon a dome ring, showing the invention in plan, certain parts 'in said ligure being shown in section and Vothers removed ,to more fully disclose the details of the device;

` Fig. 2 is a sectional `View on the line 2?-2 of Fig. 1; Y r Fig. 3 is an endelevationl of one of the securing elements for the cover showing the manner of attaching the elements to the dome ring, and i Y Fig. 4C is a side elevation of a'modiied form ofthe cover securing element and domel cover, the Vdomecover anddome ring being shown in section.V

This invention relates toa tank dome closure and hasparticular reference to securing means therefor.V v

' One object of the invention is the prodome covers. Another objectof in which the line of force thereof is exerted ring. A still further object of the invention is the provision of means for securing a dome cover to a dome ring, said means comprising securing bolts which `are so positioned that in'their fastening position they are arranged `directly above and in line with the dome ring thus relieving the remainder ofA thedome cover of any stresses. Y

i Another object ofthe invention is the provision of a supporting means for cover sei curing elements, which is hingedly mounted and is so, arranged that when the securing means are in operative position, the hinge joint is relieved of all strains.

ltachment with the cover while [ring having a liange Dsecuredto the head A -more specificallyvthe' vertical flange 2'thereof, andthe upper edgeof'the vertical flange visionof a securing means for pressed lmetal the invention is the provision of 'a securing means for domecovers in a vertical direction in line` with the dome This invention-also contemplates the provision fof .securing means for tank dome covers which cannot-g be released from atthere .is eX cess pressure in the tank.` j 3 `Another object of the invention is the provision of a novel means ofse'curing pressed l metal dome covers to adome ring or the like 4which Vis inexpensive to manufacture and strong anddurablein operation.V y

i Other objectsv and advantages of this invention willr be apparent from thefollowing description taken inf yconjunction with the vaccompanying drawings,` in which A-indicates generally'the-head of a tank donnera4 very small portionA thereof only being shown, the same being provided with the Vusualop'ening B, while C'ind-icatesgenerally a dome byfrivets E. y p a A i f g The verticalportion of the dome ring is indicated at 2,while the cover of thel dome v is shown at 3 inFig. 2.v This dome cover is formed of suitable metalv cast into the form shown more clearly in Fig. 2,`a"nd isformed` of such size as to overliethedome'ring C,

2 is preferably yiattened as at 4to provide a seat for the cover'B. rThe underface ofthe `cover isnprovide'd-V with .an annular recess, undercut at its/sides and in 'said recess 'is positioned a suitablepacking'to effect a seal between the cover and the'dome ring, as will `be apparent.v `:The coverfis formed with a depending annular centeringand reinforcing flange 8 arranged vto lie within the-dome ringCfasclearly shown injFi'g. 2.

The cover is also provided with spaced recesses or depressions 10 arranged clrcumferentially aroundfthe cover and so` positioned that they lie immediately over the dome ring C for a purpose to be presently described.

Extendin outwardly from the dome ring are a pluraity of kspaced pairs .of ears 12v between each of which pairs is hingedly mounted a casting in the form ofl an arm 14. serving as `a screw `carrying element.' The screw carrying elements or arms 14 are preferably of the form shown clearly in Fig. 2

and each comprises an attaching end l5 which may be termed a retainer extension, apertured to receive a pintle 16 which is supported by the spaced ears 12. As clearly shown in Fig. 2, the apertures are elongated vertically thereby providing a more or less loose connection forward edge ofwhich defines a stop element f fo-r limiting Ytheupward inovement ofthe casting 14 on thepintle 16to accurately poa slight recess or indentedarea formed in the body. portion-22 rofsa-id-casting: AThe lower .surfacelofthe flange V18 `provides an abutment-against which'v the attaching end 15 is adapted tobind, the attaching yendberanged adjacent the areag-20g the construction ing formed with ashoulderliportion lfarthus providing an angleshaped ,pocket-into which the flange .18 extends. Tlieybody vpor` tion '22 of the casting.orsc1rew carrying element terminates in a .b'ent upper lend 24 Yproviding a screw receiving portion, andthe end of the portion 24 .is.bent.downwardlyJ and then reverselybafckward as at 26 and; 28 respectively; the ieversely bent end-28 beingso arranged as to .be engaged withina socket indicated generally at 30. `The screwV receivingportion 24 is providedwith oppositely extending Vbearing bosses 32 and 34 respectively'V through whichV and throughthescrew receiving portion 24 a binding screw 36 threadedly extends. The f upper end Vof the yscrew is providedwith ahead 38andthe lower end isupset asy at4()` tofoim avbeai'ing surface which vinthe securing position ofthe screwengages the cover-in; lthe depression '10 formed therein.v The socket 30 inthe instancedisclosed in Fig.' 2 facesl inwa'rdlyorto` be'more exact faces towards thevcenter ofthe dome covers?) and comprisesy a vertical-portion 42 'and a horizontal portion 44 zwhich functions asy a stop element ashereinafter described-: The

socket 30' is openv at one. end -as shown at 46 (see Fig. 1) .and thecpposite end isyfclosed by a-platef48 which-defines an abutmentifor limiting lthe .rotation -o-f'the cover ','Referr'ing now to Fig. y4 which discloses'a modified form'ofthe invention, itcan be seen that-the cover 3 is formed of' metal pressed into'the desired shape and has secured thereto by rivets 51, the socketsI 50 (one only being shown). The sockets 50are so positioned as to receive the ends of the horizontal or screw 4receiving portions 52 of castings v54. The 'castingl 54 shown in Fig. -4 isnot provided with the returned end shown in Fig. 2, but otherwise the construction thereof, the cover 3 and the screw are identical and hence the same reference characters are applied thereto. i

Y In use, with the cover removed from the the sockets formed onthe dome cover. sition said casting,`the forward "edge of said Vstop element being adaptedto engage within dome ring, the casting is usually thrown to the position shown in dotted lines in Fig. 2. When the cover is positioned on the dome ring C the screws 36 are backed up in their threaded engagement with the screw receiving portions 24. and52 respectively, and the castings are' moved on their hinges toaposition over the top of the dome cover. The cover is then rotated to position the-returned end 28 shown in Fig.l 2` or the forwardedge of the bolt 75 ofthe abutmei'itsat the end of each socket. 80

The dome cover lhaving assumed the proper fpositi'on, the screws 36 may-then be screwed downwardly through thefscrew receiving por tions until their lower ends are engaged within the depressions 10 formed in the dome cover,Y 35

and thus the dome coveris rigidly secured to ltherdonie ring C. 7h/en this has been'done, Y u

vwill be apparentthat the pressure required in securing the covern tothe dome ring C is exertedy in line' with the` dome ring G; angel) extremely simple and advantageous construction, as will be apparent. It cairfurtherv be seen that as the screws 86 are tightened, the

lcastings 14 are pulled upwardly until the attaching ends 15 bindagainst the lower sur-2395 faces of the anges '18 thus relieving the pintles of all strain.

Y Inlreleasingvthe dome vcover fronifits en- 'gagenientwith-the dome ring, the screws -36 are backed up in the screw receiving por-w10@ tions, and if there is normal pressure in the tankthe'cover 3 may be rotated todisengage c the ends of the screwgreceiving portions from the sockets' andthe-castings may then be swung to the position shown in dottedios .lines in Fig. 2 andsthecover removed. If, however, there .is excess gas pressure within the tank, it will be apparent that uponunscrewingfjthe screws 36. the cover will be forced -upwardly and the` lower ends of thei .11o

screws will be retained in the depressionslO of the. cover', thusipreventing'a rotation of the cover.- Becauseof the engagementfofV thelowerends ofthe screws 36 withthe de- A pressedportions .'lOjof the cover, it.. will bez: 115

apparent that the cover cannot be rota-tedv to freethe same froniits engagement'with the castings until suflicientgasl has been vented from the tank to permit the cover to-drop to free the lowerv ends of the screws from?. i

their engagement with the depressions. This construction, therefore, in addition to providing a simple and easy locking means for the dome cover, provides a safety device which prevents'the blowing off of the cover fromli the ring or a removalthereof from the 'ring while there is excess or dangerous pressure withinv the tank. l y

What is claimed is :i

1. In a tank dome, a'V dome ring,- a-cover l?? adapted to seat thereon, a plurality of sockets on said cover, castings piif'otally secured to the dome ring and having a bent upper end adapted to overlie the cover when the castings are swung on their pivots and to be engaged within the sockets, clamping means adjustably mounted in the bent upper ends, and means for limiting the upward movement of the castings on their pivots whereby the clamping means engage the cover at points in line with the dome ring to secure the cover to said ring. Y

2. In a tank dome', a dome ring,-a cover adapted to seat upon the ring and provided with a circumferentially arranged row of depressions adjacent its edge, a socket having Y one open end arranged on the cover adjacent such depression, clamp carrying elements pivotally secured to the dome ring and adapted to be swung to overlie the cover with the ends thereof positioned in the sockets, and clamping means in said elements for engaging in said depressions to secure the cover to the ring.

8. In a tank dome, a dome ring, an external flange on said ring, a plurality of securing elements pivoted to the dome ring and movable over the latter, said elements having end extensions adapted to overlie the manhole openingl of the dome, a domecover having a plurality of sockets adapted upon rotation of the cover to be engaged by said extensions to normally position said cover,

said cover having a plurality of depressions formed along its marginal edge, and clamping elements carried by the securingelements for engaging in thedepressions whenL the cover is in normal position.

4. In a tank dome, a dome ring, a cover normally seated thereon, and means for securing said cover comprising arms pivoted to said dome ring and adapted to swing upwardly so that a portion of each thereof overlies the cover, clamping elements carried by the arms for securing the cover, means' intermediate the clamping elements and the pivoted ends of the arms for limiting the up-V ward swing of the latter and for taking the effective upward clamping stresses whereby to relieve the pivots of strain, and means with which said arms engage for preventing removal of the cover upon release of the clamping elements until afterventing of excess pressure from the dome.

5. In a tank dome, av dome ring, a cover normally seated on the ring, arms loosely pivoted to the dome ring, clamping elements carried by said arms for engaging the cover to secure the latter on the dome ring, means extending outwardly from the dome ring adjacent the pivots and with which the arms contact when the dome cover is secured to relieve the pivots of strain, said means limiting the upward swing of the arms to position the clamping elements in alignment with the dome ring. Y t

6. In a tank dome, a dome ring, la dome cover, spaced lugs extending outwardly from the dome ring, a pintle in said lugs, a Harige connectingsaid lugs and arranged abovethe latter, an arm pivotally connected at its lowery being urged to clamping position wherebyv said carrying element binds against the flange without transmitting the clamping strainrto thefpintle.l

In witness whereof I have hereunto set my hand. j j y JOHN BEYER. 

